654
FXUS65 KBYZ 251901
AFDBYZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
101 PM MDT FRI SEP 25 2026
KEY MESSAGES
- DRY COLD FRONT TONIGHT BRINGS COOLER TEMPERATURES THIS WEEKEND.
- UNSETTLED CONDITIONS SUNDAY INTO MONDAY WILL KEEP SEASONABLE
TEMPERATURES AROUND AND INTRODUCE SMALL TO MODERATE CHANCES FOR
PRECIPITATION.
DISCUSSION
TODAY THROUGH THURSDAY...
A SHORTWAVE AHEAD OF TROUGHING OVER THE PACIFIC NW IS SET TO MOVE
THROUGH OVERNIGHT TONIGHT. THIS IS EXPECTED TO BRING A DRY COLD
FRONT THROUGH THE REGION WITH BREEZY SOUTH TO SOUTHEAST WINDS
AHEAD OF THE FRONT TODAY ACROSS SOUTHEAST MT. EXPECT GUSTS 20-35
MPH THROUGH THE DAY, WITH POTENTIALLY STRONGER NORTHWEST WINDS
(35-45 MPH) WITH THE FRONT ACROSS THE REGION OVERNIGHT. AS A
RESULT, CONDITIONS WILL BE COOLER FOR THE WEEKEND. APPROACHING
TROUGHING IS EXPECTED TO KEEP SOUTHWEST FLOW IN PLACE, MOVING INTO
THE REGION SUNDAY INTO MONDAY. WITH ENSEMBLES STILL SHOWING THE
ENERGY SPLITTING AS IT MOVES INTO MT, WEAK FORCING WILL YIELD
LITTLE IN THE WAY OF PRECIPITATION. CURRENTLY, AREA MOUNTAINS AND
SOUTHEAST MT ARE EXPECTED TO BENEFIT FROM THIS EVENT. AMOUNTS HAVE
TRENDED DOWN AND THERE IS NOW ABOUT A 20-40% CHANCE FOR A QUARTER
INCH OF PRECIPITATION FOR AREA FOOTHILLS AND SOUTHEAST MT. AREA
MOUNTAINS HAVE ABOUT A 50-70% CHANCE FOR THIS SAME SUNDAY THROUGH
MONDAY PERIOD. THE SNOWFALL FORECAST FOR THE MOUNTAINS HAS ALSO
DECREASED WITH ABOUT A 40% CHANCE FOR AN INCH AT THE HIGHEST
PEAKS MONDAY INTO TUESDAY MORNING. THE BEARTOOTH PASS NOW HAS
LESS THAN A 10% CHANCE FOR AN INCH. FOLLOWING THIS SYSTEM, THE MID
LEVEL PATTERN LOOKS TO BECOME MORE ZONAL KEEPING SEASONABLE
TEMPERATURES AROUND WITH NO OBVIOUS WEATHER SYSTEMS AT THIS TIME.
HIGH TEMPERATURES ARE EXPECTED TO BE WARMEST TODAY, IN THE 70S TO
LOW 80S, COOLING TO THE 60S AND LOW 70S FOR THE REMAINDER OF THE
PERIOD. TS
AVIATION
VFR CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD. A DRY COLD FRONT
MOVES ACROSS THE TAF SITES TONIGHT WITH WINDS SWITCHING TO THE
NORTHWEST WITH THE FRONTAL PASSAGE. A BRIEF PERIOD OF GUSTY
NORTHWEST WINDS IS POSSIBLE TONIGHT, WITH GUSTS OF 20 TO 30 KTS.
MUCH OF THIS WIND IS EXPECTED TO REMAIN ABOVE THE SURFACE THANKS
TO AN INVERSION AND ONLY WEAK COLD AIR ADVECTION.
PRELIMINARY POINT TEMP/POPS
SAT SUN MON TUE WED THU FRI
-----------------------------------------------------------
BIL 052/070 047/063 047/067 046/073 050/071 048/071 048/064
00/U 02/W 21/E 00/U 10/U 00/B 13/W
LVM 044/069 042/065 040/068 039/072 043/071 042/072 041/063
00/B 01/E 22/T 00/U 10/U 11/B 14/W
HDN 049/072 044/068 045/068 044/074 046/072 044/073 045/066
00/U 01/B 31/E 10/U 10/U 00/B 12/W
MLS 055/070 047/068 050/068 046/073 049/071 048/071 049/066
00/U 01/B 43/W 00/U 10/U 00/U 11/B
4BQ 055/070 049/072 052/066 047/073 050/071 048/072 050/068
00/U 01/E 63/W 10/U 10/U 00/B 01/B
BHK 053/071 044/068 048/067 044/072 046/071 044/070 045/066
00/U 02/W 85/W 10/U 10/U 00/B 11/B
SHR 048/073 043/068 045/065 041/071 044/071 042/072 043/067
00/U 01/B 25/T 30/U 10/U 00/B 01/B
BYZ WATCHES/WARNINGS/ADVISORIES
MT...NONE.
WY...NONE.
WEATHER.GOV/BILLINGS
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page